Cream butter and flour. Add nuts and press with wet spoon into 9x13x2inch pan. Bake at 350 degrees for 25-30 minutes. With mixer on low,cream cheese and sugar well. Add Cool Whip and mix. Spread over bakedcrust. While this is setting, prepare pudding mix with 3 cups milk.Pour over second layer and let set. Spread thin layer of Cool Whip ontop and sprinkle with chopped pecans.